Specific fluorinated compounds used as an organic solvent for lithium salts

Abstract

The disclosure relates to fluorinated compounds of following formula (I): where: X 1 is a sulfur atom; X 2 and X 3 are an oxygen atom or sulfur atom provided that, if one of said X 2 and X 3 is a sulfur atom, the other of said X 2 and X 3 is an oxygen atom and vice versa; and R 1 , R 2 and R 3 are each independently a fluorine atom or hydrogen atom, provided that at least one of said R 1 , R 2 and R 3 is a fluorine atom. The disclosure further relates to use of these compounds as organic solvents of at least one lithium salt.

1 . A fluorinated compound of following formula (I): 
       
         
           
           
               
               
           
         
         where: 
         X l  is a sulfur atom; 
         X 2  and X 3  are an oxygen atom or sulfur atom provided that if one of said X 2  and X 3  is a sulfur atom, the other of said X 2  and X 3  is an oxygen atom and vice versa; and 
         R 1 , R 2  and R 3  are each independently a fluorine atom or hydrogen atom provided that at least one of said R 1 R 2  and R 3  is a fluorine atom. 
       
     
     
         2 . The fluorinated compound according to  claim 1  wherein R 1 , R 2  and R 3  are each a fluorine atom, having the following formula (IV): 
       
         
           
           
               
               
           
         
       
     
     
         3 . The fluorinated compound according to claim which corresponds to a compound of one of the following formulas: 
       
         
           
           
               
               
           
         
       
     
     
         4 . A method of forming a composition comprising combining at least one lithium salt and a fluorinated compound according to  claim 1  as organic solvent of the at least one lithium salt. 
     
     
         5 . A composition comprising at least one fluorinated compound as defined in  claim 1  and at least one lithium salt. 
     
     
         6 . The composition according to  claim 5 , wherein the composition is a lithium ion-conducting electrolyte. 
     
     
         7 . A lithium battery comprising at least one electrochemical cell comprising an electrolyte as defined in  claim 6  arranged between a positive electrode and a negative electrode. 
     
     
         8 . A composition comprising at least one fluorinated compound as defined in  claim 2  and at least one lithium salt. 
     
     
         9 . A composition comprising at least one fluorinated compound as defined in  claim 3  and at least one lithium salt.